Remove hardcoded compiler and optimiation flags.

Index: src/makefile
--- src/makefile.orig
+++ src/makefile
@@ -90,29 +90,16 @@ NE_NOWCHAR=
 NE_DEBUG=
 NE_TEST=
 
-ifeq ($(origin CC),default)
-CC=c99
-endif
+GCCFLAGS=-std=c99 -Wall -Wno-parentheses -fno-strict-aliasing -Wp,-D_FORTIFY_SOURCE=2
 
-# Test for GCC
-ifneq (,$(findstring gcc,$(shell $(CC) 2>&1)))
-GCCFLAGS=-std=c99 -Wall -Wno-parentheses -fno-strict-aliasing -flto=auto -ffat-lto-objects -Wp,-D_FORTIFY_SOURCE=2
-LDFLAGS=-flto=auto
-endif
-
 CFLAGS=$(GCCFLAGS) \
 	-D_REGEX_LARGE_OFFSETS -D_GNU_SOURCE -DSTDC_HEADERS -DHAVE_SNPRINTF \
-	$(if $(NE_NOWCHAR), -DNOWCHAR,) \
-	$(if $(NE_TEST),    -DNE_TEST -coverage,) \
-	$(if $(NE_DEBUG),   -g -O -fsanitize=address -fsanitize=undefined,-O3 -DNDEBUG) \
-	$(if $(NE_TERMCAP), -DNE_TERMCAP,) \
-	$(if $(NE_ANSI),    -DNE_TERMCAP -DNE_ANSI,) \
 	$(OPTS)
 
 LIBS=$(if $(NE_TERMCAP)$(NE_ANSI),,-lcurses)
 
-ne:	$(OBJS) $(if $(NE_TERMCAP)$(NE_ANSI),$(TERMCAPOBJS),)
-	$(CC) $(LDFLAGS) $(if $(NE_TEST), -coverage,) $(if $(NE_DEBUG), -fsanitize=address -fsanitize=undefined,) $^ $(LIBS) $(OPTS) -lm -o $(PROGRAM)
+ne:	$(OBJS)
+	$(CC) $(LDFLAGS) $(OBJS) $(LIBS) $(OPTS) -lm -lcurses -o $(PROGRAM)
 
 clean:
 	rm -f ne *.o *.gcda *.gcda.info *.gcno core